It's Pi Day...if you're a Big Bang Theory fan, or fan of math in general, you "get" why.  If not, well, in layman's terms, it's 3/14.

Bringing you back to 7th grade math class, Pi is the ratio of the circumference of a circle to its diameter...approximately 3.14159 (if you've got an Amazon Echo, have fun asking her what Pi is.  Or, if you don't believe me, watch this.).

Nerds (said with love) have been "celebrating" the date since 2009 when the House of Representatives passed a resolution to recognize it (yes, that happened).

But for me, that means deals on stuff...including my favorite pie -- the pizza pie.  Here are some deals I came across....

  • Getty Images

    Domino's Pizza

    Get two medium two-topping pizzas for $8.99

  • Moment Editorial/Getty Images

    Papa John's

    Two topping large pizzas or a pizza pie is $9.99

  • Getty Images

    Pizza Hut

    Get two large two topping pizzas for $7.99 **Must be ordered online

  • The Washington Post/Getty Images

    Boston Market

  • The Washington Post/Getty Images

    Think Geek

    Get a FREE Pi t-shirt  when you order more than $31.14 worth of stuff.

    Also, $3.14 shipping or 3.14% off when you use promo code: YAYPIDAY